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A213373 Total number of pairs of states of the first n subshells of the nuclear shell model in which the subshells are ordered by energy level in increasing order. 7
1, 3, 4, 7, 8, 10, 14, 16, 19, 20, 25, 29, 32, 38, 40, 41, 45, 50, 57, 59, 62, 63 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

First differs from A212123 at a(14). For more information see A213372.

LINKS

Table of n, a(n) for n=1..22.

MIT OpenCourseWare, Energy Levels of Nucleons in a Smoothly-Varying Potential Well

FORMULA

a(n) = A213374(n)/2.

EXAMPLE

Written as an irregular triangle in which row j is related to the j-th shell of nucleus. Note that row 4 has only one term. Triangle begins:

1;

3, 4;

7, 8, 10;

14;

16, 19, 20, 25;

29, 32, 38, 40, 41;

45, 50, 57, 59, 62, 63;

...

CROSSREFS

Partial sums of A213371. Other versions are A210983, A212013, A212123, A213363.

Cf. A018226, A213372, A213374.

Sequence in context: A210983 A213363 A212123 * A332059 A229081 A070874

Adjacent sequences:  A213370 A213371 A213372 * A213374 A213375 A213376

KEYWORD

nonn,tabf,hard,more

AUTHOR

Omar E. Pol, Jul 16 2012

STATUS

approved

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Last modified August 9 20:09 EDT 2020. Contains 336326 sequences. (Running on oeis4.)